to release the air or gas from (something inflated, as a balloon)

They deflated the tires slightly to allow the truck to drive under the overpass.

to depress or reduce (a person or a person's ego, hopes, spirits, etc.); puncture; dash

Her rebuff thoroughly deflated me.

to reduce (currency, prices, etc.) from an inflated condition; to affect with deflation.

to become deflated.

adjective

burst , contracted , drained , empty , exhausted , kaput , punctured , reduced , sagging , shrunken